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Publication numberUS3295230 A
Publication typeGrant
Publication dateJan 3, 1967
Filing dateJul 22, 1963
Priority dateJul 22, 1963
Publication numberUS 3295230 A, US 3295230A, US-A-3295230, US3295230 A, US3295230A
InventorsAndrew Szerenyi, Anton Liebscher
Original AssigneeRo Search Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Anti-skid soles
US 3295230 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Jail- 3, 1967 A. SZERENYI ET AL 3,295,230

ANTI-SKID SOLES Filed July 22, 1965 "**wxxwmwm maaalzw United States Patent 3,295,230 ANTI-SKID SOLES Andrew Szerenyi and Anton Liebscher, Waynesville, N.C., assignors to Ro-Search, Incorporated, Waynesville, NC. Filed July 22, 1963, Ser. No. 296,534 1 Claim. (Cl. 36-59) The invention refers to anti-skid soles, as used mostly for outdoor footwear. Such soles, often of natural or synthetic elastomeric material, are customarily provided with ribs, etc., in a configuration to increase the friction between the tread surface of the sole and the ground on which the wearer of the footwear moves.

One object of the invention is to provide an anti-skid tread sole without ribs or similar configurations while at the same time improving the skid resistance of the tread surface.

Other objects of the invention and its realizations are clarified hereinafter in connection with the drawings.

FIGURE 1 shows a view of the sole of a shoe showing layer-inserts in the forepart of the sole, as well as in the heel;

FIGURE 2 shows a cross section of the sole along the line A-A of FIGURE 1;

FIGURE 3 shows a similar cross section through an anti-skid sole according to another execution of the invention;

FIGURE 4 shows in a larger scale part of a cross section through a sole having narrow slits in the layerinsert of the tread sole;

FIGURE 5 shows also in cross section still another execution of a tread sole with an anti-skid layer-insert;

FIGURE 6 shows in cross section part of a mole as can be used advantageously for the method of molding soles according to the invention.

In the realization of the invention shown in FIGURES 1 and 2, a tread sole 3, which, in this example, is connected to the upper 1 by molding and vulcanizing in situ .a mix for a midsole 2 of porous rubber. In the forepart of the tread sole the invention provides a layer-insert 4 of elastomeric material much softer than the wear-resisting remaining part of the tread sole 3. If the tread sole consists of leather, the anti-skid layer 4 might be rubber with a Shore hardness of 50 to 60, or if the tread sole consists of pro-vulcanized rubber of Shore hardness 80, it is advisable to use for the anti-skid insert elastomeric material with only 30 to 50- Shore hardness. When synthetic elastomeric material is used for the tread sole as well as for the layer-insert, both might be selected as identical types of material, as long as the formulation for each part provides for the tread sole a much harder, and for the layer-insert a much softer grade.

The anti-skid effect of the sole according to the invention is assured, if the layer-insert is not only soft, but extends at least in the ball section of the tread surface over most of its width. It has further been found of advantage to let the layer-insert project from the remaining tread surface by some small amount, perhaps A; of an inch, so as to assure that the pressure from the foot of the wearer is exerted against the anti-skid surface. This is shown in Fig. 3 where a mid-sole of soft elastomeric material connects the upper 1 with the tread sole 3. The inner edges 5 of the tread sole are embedded in the elastorneric material which penetrates through the cutout of the tread sole and projects slightly beyond the plane of the tread sole 3.

Further, it is important to provide in the anti-skid layer-insert narrow slots such as shown at 6 in FIGURE 4. Such slots should be as narrow as case of manufacture allows, :perhaps 1 of an inch, when produced by molding of an elastomeric mix in a suitable mold. The

depth of the slots should always be a multiple of their width, as also their spacing should be a multiple of their width. Such proportions give a high anti-skid effect and at the same time acceptable wear resistance and avoidance of collecting sand or mud in the sole. By filling the slots with highly deformable porous elastom-eric material, a sole can be obtained which presents a smooth surface to the outside and can easily be wiped dry on the usual door mat while still presenting a highly effective anti-skid feature.

In some instances it might be sufficient to provide the wear surface of the tread sole with a relatively thin antiskid layer, extending over the ball portion of the tread sole, applied as strips in the indicated area. In most instances it is preferred to provide anti-skid inserts as heavy as the tread sole itself or heavier, and to provide anti-skid layer-inserts also in the heel part of the sole, as indicated in FIGURE 1.

As shown in FIGURE 1, the slots in the layer-insert 4 are arranged in a longitudinal direction, as this has been found highly effective. Sometimes, as shown at 15 in FIGURE 1, there might be more than one series of slots. They are then arranged so that slots of one series cross the slots of another series. For ease of manufacture the slots might be arranged to be parallel to each other in each series, and curving of each slot and spacing in accordance with the pressure distribution over the ball part of the sole during walking would be preferred.

As shown in FIGURE 2, the layer-insert 4 might be located mostly in a hollow of the tread sole 3. Savings can be obtained by providing in the tread sole a cut-out roughly corresponding to the size of the layer insert 4. The inner edges might be, as shown in 5 in FIGURE 3 fully embedded in the material of the midsole 2. This material will expand beyond the cut-out so as to form the soft layer-insert. If the pre-molded insert is provided, as shown in FIGURE 4, a shoulder 7 is molded in the insert for the location and bonding of the edge of the cut-out.

When using tread soles of leather, it is of advantage, as shown in FIGURE 5, to mold the layer-insert 14 to the tread sole 13 prior to the placing of the tread sole into the mold customarily used to unite the tread sole by means of a curable midsole to the upper.

FIGURE 6 shows such mold in cross section. Here the upper 9 is mounted on the last 8 and a frame 10 usually divided, is placed against the edge of the upper. A sole bottom plate 11 serves to close the cavity 12 and to exert pressure. The material for the midsole 2 is placed into the cavity before closing together with the previously prepared insert, or with a tread sole as previously described. The sole materials are then molded and cured to produce a unified sole bonded to the upper.

When using a pre-molded layer-insert, and using an inverted mold, as shown in FIGURE 6, the invention further provides a method which assures the exact location of the layer-insert even if only a smooth sole bottom plate is used without recesses, etc. In such applications the invention provides that the layer-insert is placed into the mold cavity only after an initial, short molding of all other sole material has occurred. After such first molding, which might last only a few seconds, the mold cavity is opened again and the insert placed into the desired location. The mold is then closed and held under heat and/or pressure until the cure of the sole material is completed. As all the flow of sole material is completed in the first molding steps, the dislocation of the insertotherwise unavoidable-is prevented. This method allows the use of various sizes of inserts in the same mold, without any alteration of the mold itself.

While in the foregoing examples the use of pressure molding has been described as it is customary for rubber, it is understood that for other material other manufacturing methods, such as slushmol ding, might be indicated. The molding of the slots has been described as an inexpensive way of manufacture, but other methods, such as sawing, might be indicated in some applications, 'as long as the slits are narrow and the opposing sidewalls of the slots [are movable in relation to each other, whether these slots are uninterrupted over their entire length or show interruptions.

What is claimed as new and useful invention is:

An anti-skid sole for footwear comprising a tread surface of wear resisting material and a layer insert of moldable material having a shore hardness of between 30 and 60 and being substantially softer than the material of said tread surface, said layer insert being surrounded by said wear resisting material and having at least a portion thereof protruding beyond the outer surface of said tread surface material, the outer surface of said layer insert having narrow slots parallel to each other and spaced apart a multiple of the individual widths of said slots, said slots extending substantially throughout the extent of said insert, and the inner peripheral edges of said wear resisting material surrounding said insert being References Cited by the Examiner UNITED STATES PATENTS 184,077 11/1876 Hanshew 36-31 X 997,657 7/1911 Drake 36-59 X 1,072,916 9/1913 Crawford 36-31 X 1,507,844 9/1924 Mason 36-59 1,587,377 6/1926 Grosjean 36-59 2,101,761 12/1937 Stagl 36-59 X 2,124,986 7/1938 Pipes 36-59 2,799,034 7/1957 Croswell 12-142 3,052,903 9/1962 La, Rose 12-142 3,177,598 4/1965 Ferrei-ra 36-30 FOREIGN PATENTS 390,761 4/1933 Great Britain.

1,016,468 11/1952 France.

JORDAN FRANKLIN, Primary Examiner.

G. V. LARKIN, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US184077 *Sep 22, 1876Nov 7, 1876 Improvement in boot and shoe soles
US997657 *Jun 15, 1908Jul 11, 1911Charles Leonard DrakeSporting-shoe.
US1072916 *Feb 20, 1913Sep 9, 1913Harvey F CrawfordShoe and tread member thereof.
US1507844 *Sep 7, 1923Sep 9, 1924Mason Herbert TTread for boots or shoes
US1587377 *Aug 15, 1925Jun 1, 1926Grosjean James ESole for boots and shoes
US2101761 *Feb 19, 1936Dec 7, 1937Charles StaglMetatarsal rubber cushion rest
US2124986 *Jun 13, 1936Jul 26, 1938Us Rubber Prod IncRubber sole and heel
US2799034 *Feb 25, 1954Jul 16, 1957United Shoe Machinery CorpMethod of providing shoe with molded tread member
US3052903 *Nov 10, 1960Sep 11, 1962La Rose William TShoe sole fastening method
US3177598 *Sep 4, 1963Apr 13, 1965Joseph F Corcoran Shoe Co IncSole unit or shoe bottom
FR1016468A * Title not available
GB390761A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4760652 *Jun 4, 1987Aug 2, 1988Quabaug CorporationComposite outsole
US5384973 *Dec 11, 1992Jan 31, 1995Nike, Inc.Sole with articulated forefoot
US5425184 *Mar 29, 1993Jun 20, 1995Nike, Inc.Athletic shoe with rearfoot strike zone
US5625964 *Jun 7, 1995May 6, 1997Nike, Inc.Athletic shoe with rearfoot strike zone
US6055746 *May 5, 1997May 2, 2000Nike, Inc.Athletic shoe with rearfoot strike zone
US6115945 *Dec 3, 1993Sep 12, 2000Anatomic Research, Inc.Shoe sole structures with deformation sipes
US6609312Dec 3, 1993Aug 26, 2003Anatomic Research Inc.Shoe sole structures using a theoretically ideal stability plane
US6748674Nov 6, 2002Jun 15, 2004Anatomic Research, Inc.Shoe sole structures using a theoretically ideal stability plane
US6763616Aug 22, 2001Jul 20, 2004Anatomic Research, Inc.Shoe sole structures
US7082697Jun 7, 2004Aug 1, 2006Anatomic Research, Inc.Shoe sole structures using a theoretically ideal stability plane
US7290357Apr 1, 2005Nov 6, 2007Nike, Inc.Article of footwear with an articulated sole structure
US7334350Jul 26, 2005Feb 26, 2008Anatomic Research, IncRemovable rounded midsole structures and chambers with computer processor-controlled variable pressure
US7392605Dec 18, 2006Jul 1, 2008Nike, Inc.Article of footwear with a stretchable upper and an articulated sole structure
US7562468Jul 31, 2007Jul 21, 2009Anatomic Research, IncRemovable rounded midsole structures and chambers with computer processor-controlled variable pressure
US7607241Oct 9, 2007Oct 27, 2009Nike, Inc.Article of footwear with an articulated sole structure
US7793430Jun 12, 2009Sep 14, 2010Anatomic Research, Inc.Removable rounded midsole structures and chambers with computer processor-controlled variable pressure
US8291614Aug 27, 2010Oct 23, 2012Anatomic Research, Inc.Removable rounded midsole structures and chambers with computer processor-controlled variable pressure
US8303885Sep 8, 2005Nov 6, 2012Nike, Inc.Article of footwear with a stretchable upper and an articulated sole structure
US8393028Apr 23, 2009Mar 12, 2013Nike, Inc.Method of manufacturing footwear having sipes
US8656607Jul 23, 2012Feb 25, 2014Anatomic Research, Inc.Soles for shoes or other footwear having compartments with computer processor-controlled variable pressure
US20110047721 *Sep 2, 2009Mar 3, 2011Sills Craig KMethod of Manufacturing Midsole for Article of Footwear
WO1983003528A1 *Apr 12, 1983Oct 27, 1983Sperry Top Sider IncOutsole
WO1991005491A1 *Oct 19, 1990May 2, 1991Frampton E Ellis IiiShoe sole structures which are siped to provide natural deformation paralleling the foot
WO2007030383A2 *Sep 1, 2006Mar 15, 2007Nike IncMethod of manufacturing an article of footwear having an articulated sole structure
Classifications
U.S. Classification36/59.00C
International ClassificationA43C13/00, A43C13/04
Cooperative ClassificationA43C13/04
European ClassificationA43C13/04